JP3198964B2 - Cable head or power cable termination - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cable head or a power cable termination for a power cable.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional cable head, in which an epoxy insulator 2 is molded outside a center conductor 1 and a semiconductive paint 3 is applied to the outer surface of the epoxy insulator. A bell mouth structure for relaxing the electric field was provided, and an insulating compound 4 was injected between the epoxy insulator 2 and a ceramic insulator 5 into which the epoxy insulator 2 was inserted.

FIG. 6 shows a conventional power cable terminal portion (air terminal portion), in which an insulator 11 made of porcelain is used on the outside, and an epoxy seat made by molding at a factory in advance is used inside. 14 and pre-moulded insulator 1 made of rubber
5 performs field relaxation using, and an insulating admixture 17 is in the filled structure. A lower bracket 13 is hermetically attached to a lower portion of the porcelain pipe 11, and
(Although not shown, refer to 12 in FIG. 3) the upper bracket is Ru mounted airtight.

In FIG. 6, a pre-mold insulator 15
Is pressed against the tapered inner surface of the epoxy seat 14 by a compression force by a spring force. The gap between the inner surface of the insulator tube 11 and the outer surface of the epoxy seat 14 is filled with an insulating mixture. The epoxy seat 14 has a bell mouth shape 19 on its own, and a metallic embedding 18 inside the body.
Are integrated.

In the above-described on-site assembling work of the aerial terminal portion, the work of filling the insulating mixture 17 will be described. As shown in FIG. 6, after the upper metal fitting temporarily attached to the insulator tube 11 at the time of assembling is removed. The air vent pipe 111 having a U-shaped tip is lowered from the upper part of the insulator tube 11,
Air vent pipe 111 in bell mouth 19 of epoxy seat
Tip insert of, while venting of the part is injected by a specified amount set in advance insulating admixture 17 from the upper portion of the porcelain bushing 11. Insulating admixture 17 was working as uninterrupted a uniform rate so as not embraced write <br/> Mioshi air during injection.

[0006]

In the prior art described above, the cable head has a bell mouth shape on the outer surface of the epoxy insulator 2 as shown in FIG. When the insulating compound 4 is injected between the insulating compound 5 and the insulator tube 5, air bubbles accumulate in the bell mouth portion outside the epoxy insulator 2, and the air bubbles may move to cause a decrease in electrical characteristics.

On the other hand, at the end of the power cable, an air bleeding pipe is used to bleed air trapped in the bell mouth portion of the epoxy seat when the insulating mixture is injected into the insulator tube 11. given but when inserting the air vent pipe into the interior porcelain bushing, damage to the porcelain bushing inside and epoxy seat
Easy to get. So you have to avoid this, but it
There has been a drawback that requires a skilled technician to.

Therefore, the problem to be solved (object) of the present invention is that, first, when an insulating compound is injected between an epoxy insulator and a porcelain tube in a cable head, the bell mouth portion outside the epoxy insulator is injected. An object of the present invention is to provide a cable head capable of preventing bubbles from accumulating. Secondly, at the end of the power cable, an air bleed pipe was used when injecting the insulating mixture into the insulator tube .
It is an object of the present invention to provide a power cable terminal that can eliminate the air bleeding operation.

[0009]

A cable head for achieving the first object (object) of the present invention comprises an insulator tube and an epoxy insulating material disposed therein and having a bell-mouth structure with semiconductive paint. In a cable head constituted by injecting an insulating compound between the body and the body, the bell mouth structure of the epoxy insulator is completely filled with an epoxy insulator formed by molding , so that a bubble is formed. The concave portion in the bell mouth structure portion of the epoxy insulator, which has been apt to accumulate, is apparently eliminated to prevent the accumulation of air bubbles.

In order to achieve the second object (object) of the present invention, a power cable terminal portion is filled with an insulating mixture between a porcelain tube and an epoxy seat having a bell mouth structure disposed therein. In the end of the power cable, the epoxy seat is formed by completely filling the bell mouth structure portion of the epoxy body with the epoxy insulator formed by molding, so that the bell of the epoxy body which needs air bleeding is formed. The concave portion due to the mouse structure is apparently lost.

[0011] The molded epoxy insulator is preferably formed by secondary molding of the primary molded epoxy body.

[0012]

FIG. 1 shows a first means according to the present invention;
In the embodiment of the cable head, the way absolute <br/> edges compound 4 in a porcelain porcelain bushing 5 is filled, in which the epoxy insulator 2 which is molded onto the center conductor 1 is provided.

The epoxy insulator 2 has a bell-mouth structure on the outer surface side, and a semiconductive paint 3 is applied to this structure to reduce the electric field. And
The recess formed by such a bellmouth structure is completely filled with the epoxy insulator 6.

The epoxy insulator 6 for embedding may be a pre-molded one, but is preferably formed by molding the epoxy insulator 2 with an additional epoxy resin.

FIG. 3 shows an embodiment of the second means according to the present invention; a power cable terminal section. FIG. 4 specifically shows an epoxy seat and an accompanying portion in the power cable terminal section.

The power cable termination of this embodiment is hollow insulator was Hi挿on the end portion of the cable 11 within the insulating admixture 17
By the way but was injected, together with mounting the epoxy seat 14 on the cable insulation, taper of the epoxy seat 14
The pre-mold insulator 15 is pressed against the inner surface of the shape by the spring force of the compression device 16. 13 lower bracket attached to the hermetically the bottom of the porcelain bushing, 12 Ru upper bracket der attached hermetically to the top of the porcelain bushing.

The epoxy seat 14 has a shape as shown in FIG. 4, and a metal embedding fitting 18 previously formed into a predetermined shape is fitted to a mold which has been processed into the shape of the epoxy seat 14. , the epoxy resin was cast into a mold, than Te, ing the epoxy seat 14 with an integrated metal embedded metal member 18 by primary molding. Then, a secondary molding die is applied to the bell mouth structure portion 19 of the epoxy seat 14 molded as described above, and the epoxy of the bell mouth structure portion 19 is formed so as to have a shape shown in FIG. The resin is injected so as to completely fill the epoxy insulator 10 by secondary molding.

FIG. 5 shows another embodiment of the second means according to the present invention, that is, an epoxy seat 14 and its accompanying parts, which are the same as those shown in FIGS. , 4 are used, so also refer to the above description regarding FIGS.

In this embodiment, only the concave portion of the bell mouth structure 19 of the epoxy seat 14 is provided with an epoxy insulator 10 'by secondary molding. This is based on the basic idea of embedding the concave portion of the bellmouth structure portion 19, and is a method of applying a minimum of epoxy insulator.

[0020]

According to the cable head of the present invention as described above, when the insulating compound is injected between the epoxy insulator and the insulator, bubbles are prevented from accumulating in the bell mouth portion outside the epoxy insulator. It is possible to achieve the desired object (object) of providing such a cable head of this type without causing a decrease in electrical characteristics.

Further, according to the power cable terminal part of the present invention, there is provided this kind of power cable terminal part which can omit the air bleeding operation using the air bleeding pipe at the time of injecting the insulating mixture into the insulator tube. The initial task (purpose) can be achieved, and highly reliable on-site work can be performed without requiring skilled skills, and the on-site work time can be shortened.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of an embodiment of a cable head according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part showing an example of a conventional cable head.

FIG. 3 is a front view showing an embodiment of a power cable terminal section according to the present invention in a half cross section.

FIG. 4 is a longitudinal sectional view specifically showing an epoxy seat at an end portion of the power cable shown in FIG. 4 and a portion attached thereto;

FIG. 5 is a front view showing a half section of another embodiment of the power cable termination portion according to the present invention.

FIG. 6 is an explanatory longitudinal sectional view showing a conventional power cable terminal portion in a state of an air bleeding operation.

FIG. 7 is a longitudinal sectional view specifically showing an epoxy seat and a part attached thereto in the power cable terminal cormorant shown in FIG. 6;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 center conductor 2 epoxy insulator 3 semiconductive paint 4 insulating compound 5 insulator tube 6 epoxy insulator (for embedding) 10 epoxy insulator (secondary molding) 11 insulator tube 14 epoxy seat (primary molding) 15 premold insulator 16 Compressor 17 Insulation admixture 18 Metallic embedding bracket 19 Bellmouth structure

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiichi Yamashita 5-1-1 Hidaka-cho, Hitachi City, Ibaraki Prefecture Inside the Hidaka Works, Hitachi Cable Corporation (72) Inventor Nobuhiro Kobayashi Hidaka-cho, Hitachi City, Ibaraki Prefecture 5-1-1, Hidaka Electric Wire Co., Ltd. (72) Inventor Setsuo Hanazono 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Inside of Hitachi Electric Cable FM Co., Ltd. (56) References Akira Mikai 59-169537 (JP, U) Fully open sho 59-169538 (JP, U) Fully open sho 59-183137 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02G 15/064

Claims (2)

(57) [Claims] 1. A cable head comprising an insulating compound injected between a porcelain tube and an epoxy insulator having a bell-mouth structure with a semiconductive paint disposed therein. model the bell-mouth structure
It is completely filled with epoxy insulation by mold molding ,
Cable head. 2. A power cable termination portion comprising an insulating mixture filled between a porcelain tube and an epoxy seat having a bell mouth structure disposed therein, wherein the epoxy seat is formed of an epoxy body. A power cable termination that completely fills the bellmouth structure with a molded epoxy insulator.